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  • Chemistry  (3)
  • nanoparticle  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Dynamic Light Scattering Measurement of Nanometer Particles in Liquids (2000)
    Springer
    Journal of nanoparticle research 2 (2000), S. 123-131 
    Details
    ISSN: 1572-896X
    Keywords: nanoparticle ; characterization ; light scattering ; PCS ; interferometry ; diffusion ; polydispersivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract Dynamic light scattering (DLS) techniques for studying sizes and shapes of nanoparticles in liquids are reviewed. In photon correlation spectroscopy (PCS), the time fluctuations in the intensity of light scattered by the particle dispersion are monitored. For dilute dispersions of spherical nanoparticles, the decay rate of the time autocorrelation function of these intensity fluctuations is used to directly measure the particle translational diffusion coefficient, which is in turn related to the particle hydrodynamic radius. For a spherical particle, the hydrodynamic radius is essentially the same as the geometric particle radius (including any possible solvation layers). PCS is one of the most commonly used methods for measuring radii of submicron size particles in liquid dispersions. Depolarized Fabry-Perot interferometry (FPI) is a less common dynamic light scattering technique that is applicable to optically anisotropic nanoparticles. In FPI the frequency broadening of laser light scattered by the particles is analyzed. This broadening is proportional to the particle rotational diffusion coefficient, which is in turn related to the particle dimensions. The translational diffusion coefficient measured by PCS and the rotational diffusion coefficient measured by depolarized FPI may be combined to obtain the dimensions of non-spherical particles. DLS studies of liquid dispersions of nanometer-sized oligonucleotides in a water-based buffer are used as examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010067107182
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  • 2
    Electronic Resource
    Electronic Resource
    Dynamic light scattering from polymers (1979)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 2 (1979), S. 73-80 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Applications of both polarized and depolarized dynamic light scattering to the study of polymers are described. Polarized light scattering is used to study translational diffusion, diffusion virial coefficients, rotational motion of long rod-shaped polymers, long-wavelength intramolecular motions, dynamics of pseudogels and gels and density fluctuations in bulk polymers. Depolarized scattering is used to study rotational diffusion of rigid macromolecules, local and long-wavelength intramolecular motions, dynamics in semi-dilute solutions, rotational motions of small molecules in glassy polymers and optical anisotrophy fluctuations of bulk polymers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1979.020021979105
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  • 3
    Electronic Resource
    Electronic Resource
    Quasi-elastic light scattering by calf thymus DNA and λDNA (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 521-542 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The quasi-elastic light-scattering (homodyne) time-correlation functions of calf thymus and λDNA are shown to contain contributions from at least two relaxation processes. A method of asymptotic analysis is described and used to obtain an estimate of the longest relaxation time as well as the “average” relaxation time and the mean-squared dispersion in this average. Most theories of scattering from macromolecules in the limit of inifinite dilution predict that the longest relaxation time is due to translational self-diffusion. The data obtained, however, indicate that the longest time is not simply related to the translational self-diffusion coefficient of unaggregated macromolecules. It is also shown that the longest relaxation time of λDNA decreases in the later stages of the denaturation transition region. Some possible mechanisms for the origin of this long time are discussed, including a model of restricted motion of a molecule by its neighbors.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140308
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  • 4
    Electronic Resource
    Electronic Resource
    Fluorescence correlation spectroscopy and Brownian rotational diffusion (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 119-137 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A theroy relating rotational Brownian motion to the time autocorrelation function of the intensity of radiation from a fluorescent system composed of spherical rotors is presented. The calculation shows three relaxation times, two associated with the rotational diffusion, and the third associated with the natural decay of the fluorescence. The correlation function contains terms that relax independently of the fluorescence decay time, thus arbitrarily extending the time range over which rotational diffusion can be studied by fluorescence.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140110
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